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Since I have a problem with my boiler I decided to drain my TF1 to see if there was a lot of buildup inside, water that came was just a little discoloured but when I slid the magnet out I noticed that the magnet itself is corroding. Just wondered if somebody can tell me if this is normal?

Hi guys hope somebody can help, I have a vaillant ecomax 828/2e around 8 years old. I turn hot water tap on and boiler fires up and temp fluctuates between 70-80 for around 3-4 mins then the temp will drop off to around 50 and just sit there, flame is on the display but I can't hear the boiler...